• Geomechanics and Engineering
• /
• 제14권3호
• /
• pp.257-269
• /
• 2018

Analysis of slope stability failures, as one of the complex natural hazards, is one of the important research issues in the field of civil engineering. Present paper adopts and investigates four soft computing-based techniques for this problem: Patient Rule-Induction Method (PRIM), M5' algorithm, Group Method of data Handling (GMDH) and Multivariate Adaptive Regression Splines (MARS). A comprehensive database consisting of 168 case histories is used to calibrate and test the developed models. Six predictive variables including slope height, slope angle, bulk density, cohesion, angle of internal friction, and pore water pressure ratio were considered to generate new models. The results of test studies are used for feasibility, effectiveness and practicality comparison of techniques with each other, and with the other available well-known methods in the literature. Results show that all methods not only are feasible but also result in better performance than previously developed soft computing based predictive models and tools. It is shown that M5' and PRIM algorithms are the most effective and practical prediction models.

• 한국전문물리치료학회지
• /
• 제15권1호
• /
• pp.30-37
• /
• 2008

This study was designed to examine the effects of temporary immobilization of the ankle and knee joints on standing in healthy young adults with the use of a postural control mechanism. The subjects were twenty-four college students (12 males and 12 females, aged between 20 and 28). A Biodex balance system SD 950-302 and its software were used to measure indirect balance parameters in standing. Each subject underwent postural stability tests in 4-different joint conditions: free joints, ankle immobilization only, knee immobilization only, and ankle and knee immobilization. In addition, the postural stability test was conducted once with the subject's eyes open and once with the eyes closed conditions. For data analysis of the postural stability tests, the overall stability index, antero-posterior stability index, and medio-lateral stability index were recorded. The overall stability index (p=.000) and medial-lateral index (p=.003) were significantly greater different conditions with eyes closed in postural stability. Therefore, the eyes closed condition is expected to be used as an effective postural stability training for treatment planning in patients with unstable postures. In addition, training based on the dynamic multi-segment model can improve postural stability and is available to therapeutic programs, helping people with unstable balance to reduce their risk of falling.

• 대한의용생체공학회:의공학회지
• /
• 제19권5호
• /
• pp.477-486
• /
• 1998

본 연구에서는 요분석용 스트립을 이용하여 요의 상태를 정량적·정성적으로 측정할 수 있는 요분석시스템을 구현하였다. 요분석시스템의 분석 알고리듬은 온도 변화, 전원 노이즈 통의 외란에 강인한 특성을 나타내기 위하여 퍼지 논리를 적용하였다. 강인하고 안정적인 요분석시스템을 설계하기 위하여 스트립 9가지 패드의 분강학적 특성을 검토하였다. 요분석시스템 하트웨어와 소프트웨어로 구성되었다. 요분석시스템의 하드웨어는 단일칩 마이크로프로세서를 사용하였고, 주변장치들로는 광하부, 트레이 제어, 전치증폭부, PC와의 통신, 열전사 프린터 및 동작 상태 표시기로 구성하였다. 요분석시스템의 소프트웨어는 시스템 프로그램과 분류 프로그램으로 구성하였다. 시스템 프로그램은 시스템 제어와 데이터 취득 및 분석을 수행하도록 하였다. 분규 프로그램은 퍼지추론부와 멤버쉽함수 발생기로 구성되었다 멤버쉽함수 발생기는 정도관리의 통계학적 방법을 이용하여 삼각형 멤버쉽함수를 생성하였다. 측정된 데이터는 PC로 전송되고, 전송된 데이터는 C++로 작성된 데이터 관리 및 취득 프로그램에 의해 저장된다. 요분석시스템의 정확도와 퍼지분류기의 안정성은 표준시료를 이용하여 평가하였다. 실험결과는 검사항목과 만족한 일치를 보였다.

• The Journal of Asian Finance, Economics and Business
• /
• 제8권5호
• /
• pp.573-581
• /
• 2021

The current study analyzed the impacts of fiscal decentralization (FD) on the economic stability of Pakistan. This study used time series data from 1981 to 2017. The collected data was first passed through the unit root analysis. ARDL estimation techniques were employed to scrutinize the data where long-run associations were tested through Wald F-statistics. The long-run estimates were extracted by applying Ordinary Least Square, and error correction mechanisms were employed to find the speed of adjustment for disequilibria between the long and the short run. Wald F-statistics confirmed the existence of long-run cointegration. Long-run elasticities suggested that fiscal decentralization because of limited institutional capabilities of provincial governments failed in bringing stability in the economy of Pakistan. Similarly, transparency issues and misspecification of projects hinder the outcome of investment to stabilize the economy. High service payments on debt cut the amount that can be used for skills improvements and destabilize the economy. High Population growth puts pressure on infrastructure and reduces production capacity, ultimately destabilizing the economy by increasing unemployment and inflation. Based on these findings, the government is suggested to improve the institutional capacity of lower governments for the desired outcome of power devolution.

• 한국항공우주학회지
• /
• 제36권5호
• /
• pp.407-419
• /
• 2008

본 연구에서는 축 대칭 원뿔 형상 위의 압축성 경계층의 천이 지점을 선형 안정성 이론과 -method를 이용하여 예측하였다. 축 대칭 좌표계에서의 압축성 유동 지배 방정식으로부터 압축성 원뿔 경계층의 선형 안정성 방정식을 얻었으며 안정성 방정식을 2차 정확도의 유한 차분법을 이용하여 계산하는 수치 프로그램을 개발하였다. 개발 된 코드로 원뿔 경계층의 안정성 특성 및 2차원 교란의 증폭률을 계산하고 실험결과와의 비교를 통해 검증을 수행하였다. 얻어진 교란의 증폭률을 활용하여 -method를 통해 천이지점 예측을 수행하였다. 풍동 시험 및 비행 시험 결과와의 비교를 통해 비행 조건에 있는 마하수 4와 8사이의 원뿔 경계층에 대한 본 연구의 천이지점의 예측 능력을 확인하였다. 또한 벽면 냉각이 경계층 내부 교란의 안정성 및 천이 지점에 미치는 영향을 분석하였다.

• 보건의료산업학회지
• /
• 제14권2호
• /
• pp.15-27
• /
• 2020

Objectives: The purpose of this study is to compare analysis of financial performance in university hospitals. Methods: Data from 2005 to 2017 were collected from income statement, balance sheet, and annual reports in 23 university hospitals. The dependent variables are used financial performance, namely, medical profit to total assets, medical profit to medical revenue, and net profit to medical revenue. The independent variables are establishment type, hospital province, bed, open liquidity, stability, and activity. Results: From 2005 to 2007, university hospitals steadily increased medical revenues, nonmedical revenues, medical profit, net profit, and reserve fund for essential business by investing fixed assets using financial leverage. From 2015 to 2017, the debt ratio was minimized based on existing management performance. Results showed that university hospitals maintained high profitability by actively investing in medical equipment, medical environment, and facilities using reserve fund for essential business. Conclusions: Results suggest that this will be the basic data for efficient management of university hospitals.

• 한국병원경영학회지
• /
• 제25권4호
• /
• pp.48-59
• /
• 2020

Purposes: The purposes of this study is analysis of business performance in national university hospitals in Korea. Methodology: Data from 2010 to 2019 were collected from balance sheet, income statement, and annual reports in 11 national university hospitals. The dependant variables are business performance which are operating margin to total assets, operating margin to gross revenue, and net income to gross revenue. The independent variables are the number of bed, hospital location, opening, liquidity, stability, and activity. Findings: In recent years, activity has been shown to have a lot of influence on management performance. National university hospitals increase profitability by using resources as efficiently as possible. The short-term debt and fixed assets have been increased rapidly in recent years. It was found that management performance has been increased through active investment using financial leverage. Practical Implications: Based on these results, this study will be the basic data for efficient management of national university hospitals.

• International Journal of Internet, Broadcasting and Communication
• /
• 제12권4호
• /
• pp.180-187
• /
• 2020

Security threats are increasing with interest due to the mass spread of smart devices, and vulnerabilities in developed applications are being exposed while mobile malicious codes are spreading. The government and companies provide various applications for the public, and for reliability and security of applications, security checks are required during application development. In this paper, among the security threats that can occur in the mobile service environment, we set up the vulnerability analysis items to respond to security threats when developing Android-based applications. Based on the set analysis items, vulnerability analysis was performed by examining three applications of public institutions and private companies currently operating as mobile applications. As a result of application security checks used by three public institutions and companies, authority management and open module stability management were well managed. However, it was confirmed that many security vulnerabilities were found in input value verification, outside transmit data management, and data management. It is believed that it will contribute to improving the safety of mobile applications through the case of vulnerability analysis for Android application security.

• The Journal of Asian Finance, Economics and Business
• /
• 제9권3호
• /
• pp.347-354
• /
• 2022

This article examines the influence of Basel III reforms, risk management, and banking sector efficiency on banks' financial stability in emerging countries. The data for this study is collected from various sources. Based on the GDP classification of IMF, the top 22 countries were selected as the sample. The sampling frame includes all six regions of the world including 482 banks and 3022 observations in total. The empirical analysis is carried out by estimating the random effects models. It is found that the effects of capital buffer, liquidity, and risk management practices are significant on financial stability. It is also noticed that the capital buffer has a constructive and significant influence on financial stability. However, liquidity management shows a mixed impact, as in some countries, its impact is positive and significant while, in other countries, it is insignificant. Risk management practices have an overall positive influence on financial stability in the case of large economies. However, results are insignificant in the case of small economies. Bank-specific variables, namely profitability, size, and efficiency have a positive whereas, loan quality has a negative impact on financial stability in the emerging countries. GDP has a positive impact on financial stability whereas inflation and unemployment both have a negative effect on financial stability.

• 지질공학
• /
• 제27권1호
• /
• pp.21-29
• /
• 2017

광미 적치사면에서 측정된 모니터링 결과와 현장조건을 고려한 수치해석결과를 이용하여 강우시 불포화 토층내 모관흡수력변화를 비교하고 이를 토대로 사면안정해석을 수행하였다. 이를 위하여 계측기간 동안 강우강도가 가장 크게 발생된 기간(72시간)을 선정하고, 대상기간 동안의 모관흡수력과 강우자료를 분석하였다. 그리고 현장에서 측정된 강우자료를 적용하여 침투 및 사면안정해석을 수행하였다. 강우에 따른 사면내 침투거동을 해석하기 위하여 SEEP/W를 활용하고 사면내 침투깊이를 고려한 사면안정해석을 위하여 SLOPE/W를 활용하였다. 먼저 현장에서 측정된 강우자료를 적용하여 SEEP/W를 이용한 침투해석을 수행하였다. 침투해석으로 계산된 모관흡수력과 현장계측으로 측정된 모관흡수력을 비교한 결과 모관흡수력의 크기에서는 다소 차이가 있으나 시간에 따른 변화양상은 유사한 것으로 나타났다. 그리고 침투해석결과와 연동하여 SLOPE/W를 이용한 사면안정해석을 수행한 결과 강우강도가 급속하게 증가되는 시점에서 사면안전율은 크게 감소하였으며, 이후 강우가 발생되지 않는 경우 사면안전율이 회복되는 것으로 해석되었다.